> On 30 Aug 2017, at 01:13, Caldarale, Charles R <chuck.caldar...@unisys.com> 
> wrote:
> Is it possible that the system is getting into swapping?  The heap has been
> set to 20 GiB, but I didn't see any mention of how much actual memory the
> system has.  Do you really need a 20 GiB heap?  Sometimes smaller is better.
> Might also want to try turning off UseHugeTLBFS.

No swap is used on the server; it has 32GB of ram. I think the heap usage is at 
most 15/16GB… in the past I tried various heap sizes and I think this size 
works well.

> I wonder if there are heap objects tied up due to dead but not collected
> metaspace items; when metaspace is GC'd, the heap usage might well shrink
> also.  (This might be a G1GC bug, but that seems unlikely.)  Perhaps the RMI
> mechanism (which I haven't looked at in many years) is searching an
> ever-growing set of soft/weak references that are removed when metaspace is
> collected.  A smaller heap might help there.

Thanks for your suggestions
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